Bath for galvanizing



Dec. 29 924 E551 N- K. TURNEULL BATH FOR GALVANZING Filed Dec. 13. 1923 Patented @ed 2, ld.

FIC L@ man non eanvenrzrnc.

Application led December 13, 1923. Serial. No. 680,559.

To all whom z't may concern.' f

Be it known that I, .NICHOLAS KING TURN- BULL, a British subject, residing at Millport, county of Bute, Scotland, haveinvented certain new and useful improvements in Baths forGalvanizing, of which the following is a specification.

This invention relates to baths for galvanizing metal articles such as wire, wire netting, sheets, tubes and other products by immersion in molten zinc in which the zinc or spelter floats upon a layer of heavier metal such as leadto which the heat is applied.

lt has been customary to heat galvanizing baths externally and the invention is designed to heat the bath internally without the escape of the products of combustion into the atmosphere and to successfully apply gas or oil firing. to the bath. y

According to the invention the galvanizing bath is constructed of steel with a series of tubes, itted with gas or oil burners, welded therein near the bottom and submerged in the molten lead.

The invention will be described with reference to the accompanying drawings.

Fig. 1 is a longltudinal sectionthrough galvanizin bath. Fig. 2 1s a transverse section of same. Fig. 3 is a longitudinal section through modified form of bath.

The galvanizing bath A is made of steel of ordinary form and at or near the bottom is fitted with heating tubes B either longitudinally or transversely of the bath which are welded into the sides of the bath. At the end of each 'tube a gas or oil burner C is fitted, eachf burner being separately controlled by al valve D supplied with :fuel

from a pipe E. rllhe oposite ends of thev tubes B connect with a t or duct B by which the products of combustion are carried away to the chimney. v

The tubes B are submerged in molten lead F to a depth of two or three inches. Above thelsurtace of this' molten lead collects the dross G that accumulates trom the articles being alvanized whilst above thisv agaln 1s the mo t'en zinc or spelter H.

The bathAl is formed with an inner lining A of refractory material closely secured-.to thesides and ends of the bath'but not to the bottom so that the bath may expand equally with the tubes, and which is preferably a non-conductor of heat and on which molten zinc has little or no action,

-and the o utside of the bath A is preferably lagged wlth a heat insulating material A2 such as slag Wool before being built up with bricks'As.

By this construction the baths are made more comfortable for the operatives to work near particularly during hot weather and no obnoxious fumes escape into the work shop as occurs with coke'red baths and also the baths are more accessible to the operatives than are any externally tired baths.

In the construction shown in Fig. 3 the tubes. B are fitted with .burners and fired from both ends, the flue or duct B? being'arranged to take away the products of combustrol and as the baths rest on a solid base having no iiues underneath or on their sides they can be insulated on the outside with a' vnon-conducting material which, together with the internal lining A -of a material unacted on by molten zinc and a` non-conductor of heat, ensuresa minimum loss of heat by radiation.

rlhe heatingtubes can be so arranged in relation to the work being galvanized and the heat in them so controlled as to ensure if so desired; a practically uniform temperature throughout the bath. ln the old type of baths heated from the sides and doing continuous work such as wires the zinc at `the sides was always slightly hotter than at most cases be considerably increased in some processes very materially (b) the baths last indefinitely (c) the work at the baths is easier, cleaner and cooler (d) the product is more uniform (le) thefuel costs including handling of fue and ashes are-low (f) the bath ,can be made lighter than in present practice (g) there are no reasonable limits to the dimensions of a bath either in width or length as heat can be applied to ensure a uniform temperature at every part of it.

What l claim as my invention and desire to protect by Letters Patent is An iron or steel bath for galvanizing metal articles in which the zinc or spelter covers a layer of heavier metal such as lead comprising in its construction a tank to contain the metal, a plurality of steel heating tubes se- Lamaze cured into the ends of the tank and passing through the tank near the bottom in such position as to be' submerged in the heavier metal, a plurality of burners fitted to heat the tubes; a ue to carry off the products of combustion from the tubes, an insulating lagging around the exterior of the-tank and an inner lining of refractory material closely secured to the sides and ends of the tank and extending below the surface of the lead.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

NICHOLAS KING TURNBULL.

Witnesses:

J. OWDEN OBRmN, GEORGE H. OBRIEN. 

